Up & Coming Extensions

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ThunderHTMLedit Requires Restart

Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.

Rated 5 out of 5 stars (5)
2,145 users

Copy Pure Text Requires Restart

Allows to copy selected text as plain text by adding a 'Copy as Text' menu item to context menu.

Rated 4 out of 5 stars (15)
4,648 users

GProxy Plus Requires Restart

GProxy Plus lets you set and clear Freegate local proxy in Firefox and Thunderbird, and do more.

Not yet rated
7,384 users

SmtpSelect Requires Restart

A toolbar button providing easy access to choosing the default SMTP server in Thunderbird.

Rated 4 out of 5 stars (36)
4,609 users

Yet Another Remove It Permanently Requires Restart

Remove elements and block content on Web pages.

Rated 4 out of 5 stars (40)
1,763 users

adaware ad block

By blocking annoying ads and nosy trackers, adaware ad block nearly doubles your browsing speed! And with the most robust antivirus-level cloud-scanning technology of any ad blocker on the market, you’ll be safe from the latest cyber-threats.

Rated 4 out of 5 stars (66)
84,863 users

ColumnsWizard Requires Restart

Adds some magic to the messages list columns!
With this addon you can:
* Add a custom column
* Set the default columns for any new folder.
* Show hidden columns in the Conversation Tab.
* Edit a mail header value for a single message.

Rated 4 out of 5 stars (7)
1,054 users

Return Receipt Toolbar Button Requires Restart

Allow you to add a Return Receipt button to mail compose window toolbar.

Rated 4 out of 5 stars (11)
5,633 users

Toggle Proxy Requires Restart

Toggle Proxy adds a status bar/toolbar icon to toggle between two proxy settings which can be set in the preferences or toggle via a shortcut key (alt + x) if you don't use the add-on bar.

Rated 4 out of 5 stars (50)
9,089 users

No Resource URI Leak

Deny resource:// access to Web content: We fill the hole to defend against fingerprinting. Very important to Firefox privacy. A direct workaround for bugzil.la/863246

Rated 4 out of 5 stars (26)
6,841 users

Old-style smilies Requires Restart

Reverts the smilies in Thunderbird to those of version 2.

Rated 4 out of 5 stars (1)
1,525 users

Lightning Reminder Left Buttons Requires Restart

Tired to mistakenly press that "Dismiss All" button? Move the Lightining Reminder "Snooze all for" and "Dismiss All" buttons to the LEFT!
... and from version 2.0 you can keep them on the RIGHT, but swapped!

Rated 4 out of 5 stars (1)
1,039 users

AutoUp Requires Restart

Transform the first letter of a sentence in uppercase

Rated 3 out of 5 stars (7)
1,455 users

gContactSync Requires Restart

Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.

Rated 4 out of 5 stars (224)
86,173 users

Add-ons Manager - Version Number

Restores version numbers for all installed add-ons inside Add-on Manager on Firefox, Thunderbird and Seamonkey.

Rated 5 out of 5 stars (22)
1,693 users

Extension Options Menu Requires Restart

Adds extension options dialogs to the Tools or Titlebar menu and includes toolbar icon.

Rated 5 out of 5 stars (53)
4,747 users

SmtpSwitch Requires Restart

SmtpSwitch allows to choose the smtp server when clicking on the 'Send' button.

Rated 4 out of 5 stars (21)
1,183 users

Use Bcc Instead Requires Restart

Who among us has not made the mistake of sending a 'broadcast' email to a large number of recipients without using BCC; thereby revealing everyone's email addresses to all? This simple add-on attempts to prevent this from occurring.

Rated 5 out of 5 stars (20)
4,123 users

Display Quota Requires Restart

This extension will display the current status of your IMAP quota in thunderbird's statusbar and will warn you when you reach a configurable limit...

Rated 4 out of 5 stars (29)
33,294 users

MR Tech Toolkit Requires Restart

(Formerly Local Install) The primary goal of this extension is to provide the tools needed to install and manage extensions and themes locally and tons of other features.

Note: With Toolkit 6.0 Auto Archiving is fully working in Firefox 2.0 and temp...

Rated 4 out of 5 stars (134)
1,704 users